Abstract
The drawing behaviour of rods (2 mm in diameter) of a polymer blend based on poly(ethylene terephthalate) (PET) and a thermotropic liquid crystalline copolyester, poly(ethylene terephthalate- co-p-oxybenzoate) (PET-POB), was investigated under conventional heating and also under microwave heating. With increasing PET-POB fraction, the modulus increased, while the drawing tension and draw ratio decreased. The microwave heating effect was found to be minimal. Sonic modulus, X-ray and birefringence measurements showed that orientation of PET-POB was induced as well as that of PET during drawing. The samples were also assessed by dynamic mechanical analysis, differential scanning calorimetry and scanning electron microscopy.
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